Adjustable base



Dec. 15, 1970 D. J. TRAlNER 3,546,918

ADJUSTABLE BASE Filed Sept. 5, 1968 S Sheets-Sheet 1 -2 2 INVENTOR.

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D86. 15, 1970 TR NER 3,546,918

ADJUSTABLE BASE United States Patent Office 3,546,918 Patented Dec. 15,1970 3,546,918 ADJUSTABLE BASE Donald J. Trainer, P.O. Box 367, 172ndSt., Grand Haven, Mich. 49417 Filed Sept. 3, 1968, Ser. No. 757,065 Int.Cl. F16m 11/12 US. Cl. 72446 18 Claims ABSTRACT OF THE DISCLOSURE frontto back direction and means are provided to lock the saddle in variouspositions of adjustment relative to the saddle support. A die holdingplate is rotatably secured to the top of the saddle and is adjustablerelative thereto. Means are also provided to lock the plate in variouspositions of adjustment relative to the saddle. Additional support forthe saddle support means are provided at a front portion thereof and ata central portion thereof.

This invention relates to an adjustable base for cut-off dies and thelike. In one of its aspects, the invention relates to a base containinga base member, a saddle support means adjustably tiltable laterallyrelative to the base, a saddle adjustably tiltable in a front to backdirection relative to the saddle support means and a die holding plateadjustably pivotable about a fixed axis relative to the saddle.

Tishken 3,111,054 discloses an adjustable cut-off machine for severingprecurved moving stock, which machine is multiply adjustable toaccommodate different curved sections. The machine has a die housingwhich is tiltable in a front to back direction relative to a bracket, acarriage supporting the bracket for rotation about a generally verticalaxis, a carriage support positioned beneath the carriage and securedthereto for tilting in a lateral direction relative to a base. Anelevator base is provided for raising the carriage support relative tothe base and is shiftable laterally relative to the base. The wholemachine, being large and rather bulky, has a moving die incorporatedinto the machine.

I have now discovered a portable base which can be used in connectionwith cut-off dies and for other machines, which base is adjustable inten different ways. The machine employs a die holding plate which issupported by and rotatable relative to a saddle. A saddle support istiltable in a lateral direction relative to the base and supports thesaddle so that it is tiltable in a front to back direction. Thisconstruction reduces the size of the base required and permits the baseto be used for many different purposes.

By various aspects of this invention, one or more of the following, orother, objects can be obtained.

It is an object of this invention to provide a small compact base whichis tiltable in front to back and lateral directions for use insupporting die-cutting machines and other similar apparatus.

It is a further object of this invention to provide a base which istiltable laterally, front to back, and rotatable about a generallyvertical axis.

It is yet another object of this invention to provide a ten wayadjustable base wherein a supporting platform for a machine is raisable,shiftable laterally, tiltable laterally, tiltable in a front to backdirection, and rotatable about a generally vertical axis.

Other aspects, objects, and the several advantages of this invention areapparent to one skilled in art from a study of this disclosure, thedrawings, and the appended claims.

According to the invention there is provided an adjustable base forsupporting machinery useful in performing die operations onlongitudinally moving, precurved stock. The base comprises a base memberhaving a back, front and sides. A saddle support means is carried by thebase and is adjustably secured thereto such that the saddle supportmeans is tiltable about a first axis laterally of the base. Means areprovided for releasably maintaining the saddle support means fixedrelative to the base.

A saddle surmounts the saddle support means and is adjustably securedthereto so as to be tiltable about a second axis generally transverse tothe first axis and generally to permit tilting in a front to backdirection. Means are provided to releasably secure the saddle supportmeans to the saddle in a plurality of relative positions. A die holdingplate surmounts the saddle and is adjustably rotatable relative theretoabout a third axis, generally transverse to the second axis andgenerally transverse to the first axis. Means are provided forreleasably securing the die holding plate to the saddle in a pluralityof relative positions. Preferably, the first and third axes intersect ata common point, at which point a die or other similar machines can bepositioned for use.

Preferably, the base contains a riser plate supported by the base memberso as to be raised and lowered relative to the base member and containsmeans for releasably securing the riser plate to the base member in aplurality of relative vertical positions. Further, a slider plate ispreferably supported by the riser plate for movement laterally of theriser plate. In this embodiment, the saddle support means is secured tothe slider plate. Means are preferably provided for releasably securingthe slider plate in a plurality of fixed positions relative to the riserplate.

The invention will now be described with reference to the accompanyingdrawings in which:

FIG. 1 is a perspective view of the base which embodies the invention,the base having positioned thereupon a cut-off die;

FIG. 2 is a side view of the base shown in FIG. 1;

FIG. 3 is a plan view of the base shown in FIG. 2;

FIG. 4 is a partial side sectional view taken along lines IVIV ofFIG.'3;

FIG. 5 is an end view of the base shown in FIGS. 1-4;

FIG. 6 is a partial sectional view taken along lines VI-VI of FIG. 2;and

FIG. 7 is a partial sectional view taken along lines VII- VII of FIG. 4.

Referring now to the drawings, an adjustable base 16 supports cut-offdie 14 at the end of forming rolls 12. Precurved longitudinally movingstock passes through the forming rolls 12 and into the dies 14 for outoff operations. As the forming rolls 12 and the dies 14 are conventionalin the art of roll forming, they will not be further described.

The adjustable base 16 has a base member 18 which supports a riser plate20. A sliding support member 22 is fixed for relative lateral movementon the riser plate 20. A saddle support 24 is secured to the slidingsupport 22 for tilting movement in a lateral direction relative to thesliding support. A saddle 26 surmounts the saddle support and is securedthereto for tilting motion in a front to back direction relative to thesaddle support. A die holding plate 28 is positioned on top of thesaddle and is rotatable about a generally vertical axis.

BASE MEMBER The base member 18 comprises a base plate 30 having a rigidupstanding track plate 32 as a back portion thereof. The track plate 32has forwardly offset upright rails with substantially parallel verticalsides.

RISER PLATE The riser plate comprises a flat plate 36 having on eachside thereof clamping flanges 38. The flanges are adjustably securedaround the upright rail through bolts 40. Blocks 42 threadably engagerods 44 which support the riser plate 20. Sockets 46in base plate areprovided to retain the bottom of the threaded rods 44.

In operation, when bolts are loosened, threaded rods 44 can be turned toraise and lower the riser plate 20 relative to the upper upright rails34 and the base member 38. When a desired vertical position has beenselected, the bolts 40 are tightened against the upright rails 34 soas'to fix the riser plate 20 relative to track plate 32 of adjustablebase 16. In this manner, the back end of the machine supporting portionof the adjustable base is raised. The manner of raising the frontportion of the machine supporting portion of the base will be describedhereinafter.

SLIDING SUPPORT PLATE The sliding support plate 22 comprises a slidingplate 48 having a rearwardly and downwardly depending hook flange 50.Slots 49 are provided in the bottom of the plate (FIG. 6) for engagingbolts 51 which are secured to plate 36. As seen in FIG. 4, the hookflange is positioned between the track plate 32 and the plate 36. Ablock 52 extends forwardly of the bottom portion of the sliding plate 48and threadably engages a threaded rod 54 which is journalled at eitherend in blocks 56 (FIG. 6).

In operation, when it is desirable to move the sliding plate 48 relativeto plate 36, the bolts 51 are loosened and the threaded rod 54 isrotated, thereby causing plate 48 to slide along the top portion ofplate 36. When the desired position has been reached, the bolts 51 aretightened to secure the sliding plate 48 tightly in the position ofadjustment relative to plate 36.

SADDLE SUPPORT MEANS The saddle support means 24 comprises a back plate58, a pair of parallel side plates and 6-2 fixed to the back plate 58and extending forwardly thereof, and a front plate 64 fixed to theforward edges of the side plates 60 and 62. The front plate 64 has acurved, upwardly facing arcuate slot 66.

A front supporting member 68 extends upwardly from base member 12 and isfixed thereto through bolt 74 which engages the front supporting member68. The front supporting member 68 is fixed to flange 72 of the basemember 18. A horizontal slot is provided at the bottom of the frontsupporting member 68 to permit lateral adjustment of the frontsupporting member 68 as the sliding support 22 is adjusted laterally ofthe riser plate 20. A bolt 78 extends through front plate 64 at slots 66and engages a vertical slot 76 of front supporting member 68. Thevertical slot permits the saddle support 24 to be raised and lowered asthe riser plate 20 is raised and lowered relative to base member 18.

The operation of the lateral movement of the saddle support meansrelative to the base member is as follows: bolt 74 is loosened prior tothe lateral adjustment of the sliding support 22 relative to the riserplate 20. As the threaded rod 54 is turned, the front supporting member68 is moved a corresponding amount. When the lateral position has beenreached, and the front end of the saddle support means has been properlypositioned, bolt 74 is 4 tightened to secure the base in the properlateral position.

Similarly, prior to raising the riser plate, the bolt 78 is loosened topermit the front end of the saddle support means to be raised or loweredas the riser plate 20 is raised or lowered. The front end of the saddlesupport means is raised or lowered a corresponding amount as thethreaded rods 44 are turned to raise or lower the riser plate 20. Afterthe proper vertical position has been obtained, the bolt 78 is thentightened to secure the saddle support means 24 fixed relative to thefront supporting member 68.

The back portion of the saddle support means 24 rests on the top surfaceof the sliding plate 48. An upwardly facing arcuate surface 68 is formedin the top edge of plate 48. A shoe 96 having a lower arcuate edge ofthe same general configuration as the arcuate surface '98 is fixed tothe back of back plate 58. Thus, the saddle support means rests at theback portion on the sliding support 22 through the shoe 96 on thearcuate surface 98.

Arcuate slots 80 are formed in the back plate 58. Bolts 82 are fixed tosliding plate 48 and extend through the arcuate slots 80 to secure theback plate 58 against the sliding plate 48. The bolts 82 are adjustable.

The saddle support means 24 is braced at a central portion thereof by apost 84 having an upper member 85 and a rounded head 86. The uppermember is adjustable upwardly and downwardly so as to permit raising andlowering of the support with the up and down movement of the saddlesupport means. Different size adjustable posts can be used to permit awide variety of vertically adjustable positions for the cut-off dierelative to the base member. A support bar extends between side plates60 and 62 and contains a socket 92 for receiving the rounded head 86 ofthe post 84. At the bottom portion thereof, the post is laterallyslidable within angle bars 88 on base plate 30.

Oppositely facing support bars extend forwardly from sliding plate 48.The support bars have forwardly extending portions 102, outwardlyextending portions 104, and forwardly extending portions 106. A threadedrod 108 is journalled at the ends thereof in the forwardly extendingportions 106. A bar 110 (FIG. 4) threadably engages the threaded rod 108and is positioned within slots 112 of depending plates 114. A crossplate 116 is secured to the side plates 60 and 62 and is secured to thedepending plates 114.

The side plates 60 and 62 of the saddle support means have valleys 118,a peak 120 and valleys 122. The valleys 118 and 122 permit substantialfront to back tilting of the saddle relative to the saddle supportmeans.

The construction is such that the saddle support means is tiltable in alateral direction, i.e. about a horizontal axis perpendicular to asliding plate 48, relative to sliding plate 48 and also relative to basemember 18. The operation of the lateral tilting of the saddle supportmeans relative to the sliding plate 48 is as follows: bolts 82 and 78are loosened. Threaded rod 108 is rotated and post 84 is moved laterallyas the tilting takes place. During the tilting, the bolts 82 will slidein slots 80 and the bolt 78 will slide in slot 66.

It is obvious that the center of curvature of slot 66 as well as thecenter of curvature of slots 80 lies on the axis of rotation of thecarriage support means. The radius of curvature of the slots and theradius of curvature of the arcuate surface 98 determine the axis ofrotation of the saddle support means. It is, therefore, apparent thatthe base can be made so as to tilt laterally about an axis at any givenheight. Preferably, the tilting axis will pass through the working areaof the equipment supported on the die holding plate 28.

When the desired tilting position has been reached, proper verticaladjustment is made to post 84, and bolts 82 and 78 are then tightened tofix the saddle support means relative to the sliding support 22.

THE SADDLE The saddle 26 comprises a top plate 124 and depending sideplates 126. An axle 128 having end bolts 130 extends through thedepending side plates 126 and through the side plates 60 and 62 of thesaddle support 24 at peak 120.

Arcuate slots 132 and 134 are formed in each depending side plate 126.Bolts 136 extend through the slots 132 and 134 and are fixed to eachside plate 60 and 62.

The depending side plates 126 have rounded bottom edges 138 with acenter of curvature at axle 128. Arc plates 94 are fixed to the sideplates 60 and 62 and have arcuate upper edges which bear against thesurface 138 and help to support the saddle 26.

A tab flange extends downwardly and outwardly of the bottom portion ofone of the depending side plates 26. A swivel shoulder 142 is rotatablyjournalled in the tab flange and, in turn, threadably engages a threadedrod 144. A second swivel shoulder 146 is rotatably journalled in plate148 which is fixed to side plate of the saddle support. The threaded rod144 is journalled in the swivel shoulder 146.

The operation of the front to back tilting of the saddle relative to thesaddle support means is as follows: when it is desirable to tilt thecut-off die supported by the base in a front to back direction, bolts136 are loosened and threaded rod 144 is rotated so as to move thesaddle support about an axis passing through axle 130. When the desiredposition is reached, the bolts 136 are tightened to secure the saddle 26relative to the saddle support means 24.

The top plate 124 contains a large circular hole 152 with a machineannular recess 150. Arcuate slots 160 and 162 are provided at eitherside of the top plate 124 and have a center of curvature at the centralportion of the large circular hole 152. A tabular flange 174 extends outfrom plate 124 and rotatably supports a swivel shoulder 172.

THE DIE HOLDING PLATE The die holding plate 28 has a large circular hole158 and a machined annular recess 154. An annular ring 156 is positionedwithin the machined annular recesses and 154 so as to guide the rotationof the die holding plate 28 relative to the top plate 124 of the saddle26. Bolts 164 are fixed to the die holding plate 128 and extend throughthe arcuate slots and 162 of the top plate 124.

A L-shaped tubular flange 166 extends down from an outer edge of the dieholding plate 28. A swivel shoulder 168 is rotatably supported by theL-shaped flange 166 and threadably engages a threaded rod 72.

The operation of the rotation of the die holding plate relative to thesaddle is as follows; when it is desirable to rotate the die holdingplate about an axis perpendicular to the top plate 124 of the saddle 26,the bolts 164 are loosened and the threaded rod 170 is rotated. Therotation of the threaded rod about its longitudinal axis forces the dieholding plate 128 to rotate about an axis through the center of thelarge circular hole 152 relative to the top plate 124. When the desiredposition has been reached, the bolts 164 are then tightened to maintainthe die holding plate 128 fixed relative to the top plate 124.

Whereas the invention has been described with reference to thepositioning of arcuate slots in a certain plate and fixed bolts inadjacent plate, it is obvious that within the scope of the invention,the position of the fixed bolts and the arcuate slots can beinterchanged without departing from the spirit of the invention.

The base described thus provides a novel supporting means which cansupport a machine which can be positionally adjusted ten ways. Themachine can be raised or lowered and it can be moved laterally. Themachine can be tilted to the right or left and it can be tilted in aback to front direction. Further, the base provides a rotation of the.machine about a fixed relatively vertical axis. Thus, the

machine positioned on the base can be rotated about three transverseaxes. In the preferred embodiment shown in the drawings, the machine canbe rotated about three mutually perpendicular axes.

In addition to the cut-off die, the base can support a punch press, adrill, or forming dies. Many other uses of the base will be suggested tothose skilled in the art.

Reasonable variation and modification are possible within the scope ofthe foregoing disclosure, the drawings, and the appended claims withoutdeparting from the spirit of the invention.

The embodiments of the invention in which an exclusive property ofprivilege is claimed are defined as follows:

1. An adjustable base for supporting machinery useful in performing dieoperations on longitudinally moving, precurved stock, said basecomprising a base member having a back, front and opposite sides;

a saddle support means carried by said base and adjustably securedthereto such that said saddle support means is tiltable about a firstaxis in a direction laterally of said base;

means for releasably maintaining said saddle support means fixedrelative to said base in a plurality of positions about said first axis;

a saddle surmounting said saddle support means and adjustably securedthereto so as to be tiltable about a second axis generally transverse tosaid first axis and generally to permit tilting in a front to backdirection;

means to releasably secure said saddle support means to said saddle in aplurality of relative positions;

a die holding plate surmounting said saddle and being adjustablyrotatable relative thereto about a third axis generally transverse tosaid second axis and generally transverse to said first axis; and

means for releasably securing said die holding plate to said saddle in aplurality of relative positions whereby machinery fixed to said dieholding plate can be adjusted to a plurality of positions relative tolongitudinally moving stock passing from said back to said front of saidbase.

2. An adjustable base according to claim 1 further comprising:

a riser plate supported by said base member so as to be raised andlowered relative to said base member;

means for releasably securing said riser plate to said base member in aplurality of relative vertical positions; and

wherein said saddle support means is supported by said riser platewhereby said machinery supported by said base is vertically adjustable.

3. An adjustable base according to claim 2 wherein said base has anupstanding track plate at a rear portion thereof, said track platehaving substantially vertical sides; said riser plate has releasableguide clamps at either side thereof, said guide clamps forming guides atsaid track plate sides; and said releasable securing means for saidriser plate comprising adjustable bolts extending through said guideclamps to draw the guide clamps tightly against said track plate.

4. An adjustable base according to claim 1 further comprising a frontsupporting member extending upwardly from a front portion of said baseand adjustably fixed to a front portion of said saddle support means.

5. An adjustable base according to claim 4 further comprising a postsupport slidable laterally relative to said base member and extendingupwardly from said base, the upper portion of said post having a roundedend; socket forming means on said saddle support means for receivingsaid rounded end of said post support whereby said saddle support meansis supported at said front, back, and in a central portion thereof.

6. An adjustable base according to claim 1 further comprising a sliderplate member carried by said base and adjustable laterally of said base;said saddle support means being adjustably secured to said slider platemember such that said saddle support means is tiltable about said firstaxis laterally of said slider plate.

7. An adjustable base according to claim 6 wherein said base has fixedthereto at a back portion thereof an upstanding plate with an upper edgewhich extends substantially horizontal; said slider plate membercomprises a vertical plate with a vertical surface adjacent to andcontacting said upstanding plate; said slider plate positioned in frontof said upstanding plate; a hook flange fixed to said slider plateextending rearwardly over said substantially horizontal surface of saidupstanding plate and downwardly behind said upstanding plate so as tosupport said slider plate on said upstanding plate; at least onehorizontal slot in said slider plate at a bottom portion thereof;adjustable bolts extending through said slots and fixed to saidupstanding plate, said bolts being adapted to be loosened so as topermit relative lateral movement between said slider plate and saidupstanding plate and adapted to be tightened so as to prevent relativelateral movement between said slider plate and said upstanding plate.

8. An adjustable base according to claim 7 wherein means are provided toactuate lateral movement of said slider plate relative to saidupstanding plate, said actua tion means comprising:

a pair of forwardly extending flanges fixed to said upstanding plate ata lower portion thereof;

a threaded rod journalled in said forwardly extending a threaded holecontaining flange extending forwardly of said slider plate between saidpair of forwardly extending flanges of said upstanding plate, saidflange threadably engaging said threaded rod; and

whereby rotation of said threaded rod about its longitudinal axis willmove said slider plate relative to said upstanding plate.

9. An adjustable base according to claim 1 further comprising a sliderplate having a flat vertical plate extending laterally of said base andhaving an upper edge with an upwardly facing concave arcuate surface;

said saddle support means has a back plate parallel to said slider plateand positioned thereagainst, side members extending forwardly from andfixed to said back plate, said plate having a lower edge formside platesat forward ends thereof;

an arc plate fixed to the upper rear portion of said back plate, saidare plates having a lower edge forming a convex are surface of the samecurvature of said upwardly facing concave arcuate surface of said sliderplate;

said are plate resting on said concave arcuate surface;

arcuate slots formed in said back plate and adjustable bolts extendingthrough said slots and fixed to said slider plate such that when saidbolts are loosened, said saddle support plate can tilt laterally on saidare plate relative to said slider plate, and when said bolts aretightened, said saddle support means is fixed relative to said sliderplate.

10. An adjustable base according to claim 9 further comprising actuationmeans to adjust the relative tilting positions between said slider plateand said saddle support means, said actuation means comprising:

a pair of support bars extending forwardly from and fixed to said sliderplate;

a threaded rod journalled in a forward end of each of said support bars;

a bar threadedly engaging said rod; and

means fixed to said saddle support means and slidably engaging said barto permit movement of said bar away from said saddle support means assaid saddle support means tilts relative to said slider plate.

11. An adjustable base according to claim 9 further comprising a frontsupporting member extending upwardly of said base at a front portionthereof and fixed to said base member;

said front plate member of said saddle support means having an arcuateslot whose center of curvature is on said first axis of rotation;

an adjustable bolt within said arcuate slot in said front plate memberand engaging said front supporting member so as to permit rotation ofsaid saddle support means relative to said front supporting member aboutsaid first axis when said bolt is loosened and to maintain said saddlesupport means fixed relative to said front supporting member when saidbolt is tightened.

12. An adjustable base according to claim 1 wherein said saddlesupporting means comprises a back plate, a pair of parallel side platesextending forwardly from and fixed to said back plate, and a front platefixed to said side plates at a forward end thereof; said saddle having atop plate and downwardly extending side plates depending therefrom,generally parallel to said saddle supporting means side plates;

axle means extending through said saddle supporting means side platesand through said saddle downward ly extending side plates, said axlemeans being substantially perpendicular to said side plates of saidsaddle supporting means and said side plates of said saddle;

arcuate slots in said downwardly extending side plates with the centerof curvature at said axle; adjustable bolts extending through saidarcuate slots and engaging said saddle support means so that said secondaxis passes through said axle, and said saddle is rotatable about saidsecond axis relative to said saddle plate support means when said boltsare loosened, and said saddle is fixed relative to said saddle supportmeans when said bolts are tightened.

13. An adjustable base according to claim 12 wherein said downwardlyextending side plates have a lower edge which forms a downwardly convexarcuate edge whose center of curvature is at said second axis; and areplates are provided at each of said parallel side plates to supportsaddle; said are plates having an upper edge forming an upwardly facingconcave arcuate surface whose radial center is at said second axis.

14. An adjustable base according to claim 12 further comprising means toactuate relative movement between said saddle and said saddle supportmeans; said actuation means comprising:

a first swivel shoulder rotatably secured to said saddle supportingmeans;

a threaded rod journalled in said swivel shoulder;

a second swivel shoulder threadably engaging said threaded rod;

said second swivel shoulder being rotatably secured to one of saiddownwardly extending side plates so that said saddle will tilt aboutsaid second axis as said rod is turned.

15. An adjustable base according to claim 1 wherein said saddlecomprises a top plate generally parallel to said second axis; a circularbore is formed in the top of said top plate; a circular bore is formedin the bottom of said die holding plate; a circular guide means ispositioned in said bore in said die holding plate and said bore in saidtop plate; at least one arcuate slot is formed in said top plate; andadjustable bolts are positioned in said slots and secured to said dieholding plate so that said die plate is rotatable about said third axiswhen said bolts are loosened and said die plate is maintained fixedrelative to said saddle when said bolts are tight.

16. An adjustable base according to claim 15 further comprising means toactuate relative movement between said die holding plate and saidsaddle, said actuating means comprising:

a first swivel shoulder rotatably engaging said die plate;

a threaded rod threadably engaging said first swivel shoulder; and

a second swivel shoulder rotatably engaging said saddle and rotatablyjournalled therein whereby rotation of said threaded rod about itslongitudinal axis will cause relative rotation between said die holdingplate and said saddle.

17. An adjustable base according to claim 1 further comprising:

a riser plate supported by said base member so as to be raised andlowered relative to said base member;

means for releasably securing said riser plate to said base member in aplurality of relative vertical positions;

a slider plate carried by said riser plate and adjustable laterally ofsaid riser plate;

means releasably securing said slider plate to said riser plate;

said saddle support means being adjustably secured to said slider platesuch that said saddle support means is tiltable about said first axislaterally of said slider plate; and

said machinery on said base is adjustable in ten different ways to anydesired selected position at any angle to a fixed horizontal line.

18. An adjustable base according to claim 17 further comprising: a frontsupporting member extending upwardly from a front portion of said baseand adjustably fixed to a front portion of said saddle support means sothat said saddle support means is vertically adjustable relative to saidfront supporting means and tiltable laterally relative to said frontsupporting member; said front supporting member being laterallyadjustable relative to said base.

References Cited UNITED STATES PATENTS 1,974,158 9/1934 Okenfuss 248-232,156,323 5/1939 Tishken 83-290 2,957,362 10/1960 Kelm 269-71 3,111,05411/1963 Tishken 83-320 3,155,383 11/1964 Whitmore 248-23 3,165,141 1/1965 Tishken 72-468 3,270,541 9/1966 Tishken 72-132 CHARLES W. LANHAM,Primary Examiner G. P. CROSBY, Assistant Examiner U.S. C1. X.R.

' 223 UNITED STATES PATENT OFFICE I CERTIFICATE OF CORRECTION Patent No.3,546 ,918 Dated December 15, 1970 Inventor) D. J. Trainer It iscertified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below:

Column 7, line 44;

Delete "said plate having a lower edge form-" and substitute thereforand a front plate member fixed to Signed and sealed this 15th day ofJune 1971.

(SEAL) Attest:

EDWARD M.FLETCHER, JR. WILLIAM E. SCHUYLER, JR. Attesting OfficerCommissioner of Patents

